#!/usr/bin/env node
/**
 * CLI for the persistent trend store (research-engine §5, foundation layer).
 *
 *   node --import tsx src/cli.ts add   --title "<t>" --url "<u>" --topics <a,b>
 *                                       [--source <s>] [--summary "<s>"] [--store <path>]
 *   node --import tsx src/cli.ts query --topics <a,b>  [--store <path>] [--json]
 *   node --import tsx src/cli.ts list   [--since <YYYY-MM-DD>] [--limit <n>] [--store <path>] [--json]
 *   node --import tsx src/cli.ts status [--store <path>] [--json]
 *   node --import tsx src/cli.ts act|skip|reset --id <id>  [--store <path>]
 *   echo '<raw item|batch>'  | node --import tsx src/cli.ts normalize
 *   echo '<scored candidates>' | node --import tsx src/cli.ts score [--mode kortform|long-form] [--threshold N]
 *   echo '<raw item|batch>'  | node --import tsx src/cli.ts capture [--store <path>] [--json]
 *   node --import tsx src/cli.ts brief  [--pillars <a,b>] [--fresh-days N] [--first-mover-days N] [--saturation-at N]
 *                                       [--out <dir>] [--no-mark] [--store <path>] [--json]
 *   node --import tsx src/cli.ts schedule --pillars <a,b> [--at HH:MM] [--fresh-days N]
 *                                          [--platform auto|launchd|cron] [--install|--uninstall] [--store <path>]
 *
 * The capture agent (research-engine) folds freshly-polled trends into the store via
 * `capture` (the normalizing batch path: stdin → normalizeItem(s) → itemToInput →
 * addTrend) — which, when an item carries the agent's five judgment scores (RE-R3a),
 * persists an optional relevance `score` (the deterministically-computed composite + band,
 * one owner) first-sight on the record so the morning brief ranks on it — and reasons over
 * accumulated history via `query`/`list`. `brief` (RE-R2b)
 * renders a dated, pillar-ranked morning brief over the store to a Markdown file the
 * SessionStart hook surfaces; RE-R3d adds a DERIVED temporal overlay (first-mover up / saturated
 * down) as a within-tier ranking refinement, tunable via `--first-mover-days`/`--saturation-at`.
 * `add` is the MANUAL single-trend path (raw flags, no
 * normalization, publish-date-free). `act`/`skip`/`reset --id` set a trend's lifecycle status
 * (RE-R3b): the morning brief EXCLUDES acted/skipped and records each surfacing (per-day-idempotent
 * `surfacedCount`) so the loop stops re-surfacing handled work; a re-capture refreshes the score
 * (timing decays). The polling + relevance-scoring itself lives upstream; this is the deterministic store.
 *
 * `normalize` + `score` (RE-R1) and `capture` (RE-R2a) are the deterministic
 * research-engine seam: all read their JSON PAYLOAD FROM STDIN (so they do not overload
 * `--json`, which stays an output toggle). `normalize` validates raw items into the
 * canonical envelope; `score` triages scored candidates (composite/band/threshold);
 * `capture` normalizes + folds each valid item into the store (persisting `publishedAt`),
 * reporting content-invalid items in the summary `errors[]`, never via the exit code.
 *
 * `schedule` (RE-R3c) is PRINT-FIRST: it emits a launchd plist (macOS) / cron line (Linux) firing the
 * DETERMINISTIC `brief` daily via the `run-daily.sh` headless wrapper, plus the exact activation command.
 * `--install` writes only the inert launchd plist FILE; the tool never runs `launchctl` or the cron table
 * (the operator runs the one printed command). No AI capture in the nightly run — that is a later slice.
 *
 * Exit code: 0 on success, 2 on usage error or a not-found id (act/skip/reset). A wrong --id is an
 * argument-class error; capture's content-invalid items stay in errors[] (never via the exit code).
 * `schedule` adds no new exit code: an autonomy install never RUNS the system mutation.
 */

import { readFileSync, readdirSync, mkdirSync, writeFileSync, existsSync, rmSync } from "node:fs";
import { join, dirname } from "node:path";
import { homedir } from "node:os";
import { fileURLToPath } from "node:url";

import {
  addTrend,
  defaultStorePath,
  history,
  loadStore,
  markSurfaced,
  newestCaptureDate,
  queryByTopic,
  saveStore,
  setStatus,
} from "./store.js";
import type { TrendStatus } from "./types.js";
import { normalizeItem, normalizeItems, itemToInput } from "./item.js";
import { triage } from "./score.js";
import type { ScoreMode } from "./score.js";
import {
  rankForBrief,
  renderBrief,
  briefSummary,
  defaultBriefDir,
  surfacedIds,
  diffSurfaced,
  parseSurfacedFrontmatter,
  selectPriorBriefFile,
} from "./brief.js";
import { launchdPlist, crontabLine, installInstructions, uninstallInstructions, defaultLabel } from "./schedule.js";
import type { ScheduleSpec } from "./schedule.js";

function parseFlags(args: string[]): Record<string, string> {
  const out: Record<string, string> = {};
  for (let i = 0; i < args.length; i++) {
    const a = args[i];
    if (a.startsWith("--")) {
      const key = a.slice(2);
      const next = args[i + 1];
      if (next === undefined || next.startsWith("--")) {
        out[key] = "true";
      } else {
        out[key] = next;
        i++;
      }
    }
  }
  return out;
}

function splitTopics(raw: string | undefined): string[] {
  if (!raw) return [];
  return raw
    .split(",")
    .map((t) => t.trim())
    .filter((t) => t.length > 0);
}

function usage(msg: string): never {
  console.error(`error: ${msg}`);
  console.error(
    "usage:\n" +
      '  add --title "<t>" --url "<u>" --topics <a,b> [--source <s>] [--summary "<s>"] [--store <path>]\n' +
      "  query --topics <a,b> [--store <path>] [--json]\n" +
      "  list [--since <YYYY-MM-DD>] [--limit <n>] [--store <path>] [--json]\n" +
      "  status [--store <path>] [--json]\n" +
      "  act|skip|reset --id <id> [--store <path>]\n" +
      "  normalize   < raw-item-or-batch.json\n" +
      "  score [--mode kortform|long-form] [--threshold N]   < scored-candidates.json\n" +
      "  capture [--store <path>] [--json]   < raw-item-or-batch.json\n" +
      "  brief [--pillars <a,b>] [--fresh-days N] [--first-mover-days N] [--saturation-at N] [--out <dir>] [--no-mark] [--store <path>] [--json]\n" +
      "  schedule --pillars <a,b> [--at HH:MM] [--fresh-days N] [--platform auto|launchd|cron] [--install|--uninstall] [--store <path>]",
  );
  process.exit(2);
}

/** Read the full JSON payload from stdin, or exit 2 if it is empty/unparseable. */
function readStdinJson(): unknown {
  let raw = "";
  try {
    raw = readFileSync(0, "utf8").trim();
  } catch {
    raw = "";
  }
  if (raw.length === 0) usage("expected a JSON payload on stdin");
  try {
    return JSON.parse(raw);
  } catch {
    usage("stdin is not valid JSON");
  }
}

function today(): string {
  return new Date().toISOString().slice(0, 10);
}

/** Whole days from one ISO date to another (floor); negative if `from` is later. */
function daysBetween(fromIso: string, toIso: string): number {
  return Math.floor((new Date(toIso).getTime() - new Date(fromIso).getTime()) / 86400000);
}

function main(): void {
  const [command, ...rest] = process.argv.slice(2);
  const flags = parseFlags(rest);
  const storePath = flags.store ?? defaultStorePath();
  const asJson = flags.json === "true";

  if (command === "add") {
    const title = flags.title;
    if (!title || title === "true") usage('add needs --title "<text>"');
    const url = flags.url;
    if (!url || url === "true") usage('add needs --url "<url>"');
    const topics = splitTopics(flags.topics);
    if (topics.length === 0) usage("add needs --topics <a,b>");
    const store = loadStore(storePath);
    const res = addTrend(store, {
      title,
      url,
      source: flags.source && flags.source !== "true" ? flags.source : "manual",
      capturedAt: today(),
      topics,
      ...(flags.summary && flags.summary !== "true" ? { summary: flags.summary } : {}),
    });
    saveStore(storePath, res.store);
    if (res.added) {
      console.log(`Added: ${title}`);
    } else {
      console.log(`Duplicate — already in store${res.merged ? " (topics unioned)" : ""}: ${title}`);
    }
    console.log(`Store: ${storePath} (${res.store.trends.length} trends)`);
    return;
  }

  if (command === "query") {
    const topics = splitTopics(flags.topics);
    if (topics.length === 0) usage("query needs --topics <a,b>");
    const hits = queryByTopic(loadStore(storePath), topics);
    if (asJson) {
      console.log(JSON.stringify(hits, null, 2));
      return;
    }
    if (hits.length === 0) {
      console.log(`No trends found for topics: ${topics.join(", ")}`);
      console.log("→ poll fresh signals (research engine), then `add` them.");
      return;
    }
    console.log(`${hits.length} trend(s) for: ${topics.join(", ")}`);
    for (const { trend, topicOverlap } of hits) {
      console.log(`\n  · (overlap ${topicOverlap}) ${trend.title}`);
      console.log(`    ${trend.url}`);
      console.log(`    topics: ${trend.topics.join(", ")} — ${trend.source}, ${trend.capturedAt}`);
      if (trend.summary) console.log(`    ${trend.summary}`);
    }
    return;
  }

  if (command === "list") {
    const opts: { since?: string; limit?: number } = {};
    if (flags.since && flags.since !== "true") opts.since = flags.since;
    if (flags.limit && flags.limit !== "true") {
      const n = Number.parseInt(flags.limit, 10);
      if (Number.isNaN(n) || n < 0) usage("--limit must be a non-negative integer");
      opts.limit = n;
    }
    const rows = history(loadStore(storePath), opts);
    if (asJson) {
      console.log(JSON.stringify(rows, null, 2));
      return;
    }
    const scope = opts.since ? ` since ${opts.since}` : "";
    console.log(`Store: ${storePath} — ${rows.length} trend(s)${scope}`);
    for (const t of rows) {
      console.log(`  · ${t.capturedAt}  ${t.title}  {${t.topics.join(", ")}}`);
    }
    return;
  }

  if (command === "status") {
    const store = loadStore(storePath);
    const newest = newestCaptureDate(store);
    const daysStale = newest === null ? null : daysBetween(newest, today());
    if (asJson) {
      console.log(JSON.stringify({ store: storePath, count: store.trends.length, newest, daysStale }));
      return;
    }
    console.log(`Store: ${storePath}`);
    console.log(`  trends: ${store.trends.length}`);
    if (newest === null) {
      console.log("  newest: — (empty store; no captures yet)");
    } else {
      console.log(`  newest: ${newest} (${daysStale}d ago)`);
    }
    return;
  }

  if (command === "act" || command === "skip" || command === "reset") {
    const id = flags.id;
    if (!id || id === "true") usage(`${command} needs --id <id>`);
    const status: TrendStatus = command === "act" ? "acted" : command === "skip" ? "skipped" : "new";
    const store = loadStore(storePath);
    const res = setStatus(store, id, status);
    if (!res.found) {
      console.error(`error: no trend with id: ${id}`);
      process.exit(2);
    }
    saveStore(storePath, store);
    console.log(`Marked ${id} ${status}`);
    return;
  }

  if (command === "normalize") {
    const payload = readStdinJson();
    const out = Array.isArray(payload) ? normalizeItems(payload) : normalizeItem(payload);
    console.log(JSON.stringify(out, null, 2));
    return;
  }

  if (command === "score") {
    const mode = flags.mode && flags.mode !== "true" ? flags.mode : "kortform";
    if (mode !== "kortform" && mode !== "long-form") {
      usage('score --mode must be "kortform" or "long-form"');
    }
    let threshold = 4.0;
    if (flags.threshold && flags.threshold !== "true") {
      const t = Number.parseFloat(flags.threshold);
      if (Number.isNaN(t)) usage("--threshold must be a number");
      threshold = t;
    }
    const payload = readStdinJson();
    if (!Array.isArray(payload)) usage("score expects a JSON array of scored candidates on stdin");
    try {
      const result = triage(payload as Array<{ scores: Record<string, number> }>, {
        mode: mode as ScoreMode,
        threshold,
      });
      console.log(JSON.stringify(result, null, 2));
    } catch (e) {
      usage(`scoring failed: ${(e as Error).message}`);
    }
    return;
  }

  if (command === "capture") {
    const payload = readStdinJson(); // exits 2 on empty/unparseable stdin
    const raw = Array.isArray(payload) ? payload : [payload];
    const { items, errors } = normalizeItems(raw);
    const store = loadStore(storePath);
    // Tally derived from AddResult {added, merged} (no `duplicates` field): a fold is
    // `added` (new), else `merged` (existing gained topics and/or a refreshed score), else a plain `duplicate`.
    let added = 0;
    let merged = 0;
    let duplicates = 0;
    for (const item of items) {
      const res = addTrend(store, itemToInput(item, today()));
      if (res.added) added++;
      else if (res.merged) merged++;
      else duplicates++;
    }
    saveStore(storePath, store);
    if (asJson) {
      console.log(JSON.stringify({ added, duplicates, merged, errors }, null, 2));
      return;
    }
    console.log(
      `Captured into ${storePath}: ${added} added, ${merged} merged, ` +
        `${duplicates} duplicate, ${errors.length} invalid (${store.trends.length} total)`,
    );
    return;
  }

  if (command === "brief") {
    const pillars = splitTopics(flags.pillars);
    let freshDays = 7;
    if (flags["fresh-days"] && flags["fresh-days"] !== "true") {
      const n = Number.parseInt(flags["fresh-days"], 10);
      if (Number.isNaN(n) || n < 0) usage("--fresh-days must be a non-negative integer");
      freshDays = n;
    }
    // RE-R3d temporal-overlay thresholds (defaults mirror brief.ts's RankOptions defaults).
    let firstMoverDays = 2;
    if (flags["first-mover-days"] && flags["first-mover-days"] !== "true") {
      const n = Number.parseInt(flags["first-mover-days"], 10);
      if (Number.isNaN(n) || n < 0) usage("--first-mover-days must be a non-negative integer");
      firstMoverDays = n;
    }
    let saturationAt = 3;
    if (flags["saturation-at"] && flags["saturation-at"] !== "true") {
      const n = Number.parseInt(flags["saturation-at"], 10);
      if (Number.isNaN(n) || n < 1) usage("--saturation-at must be a positive integer");
      saturationAt = n;
    }
    // A bare `--out` yields the string "true" (parseFlags); the guard falls back to
    // defaultBriefDir() so it never writes to ./true.
    const outDir = flags.out && flags.out !== "true" ? flags.out : defaultBriefDir();
    const day = today(); // one wall-clock read for both the ranking and the filename
    const store = loadStore(storePath); // hoisted: also needed for the surfacing write below
    const ranking = rankForBrief(store, pillars, day, { freshDays, firstMoverDays, saturationAt });
    // RE-R3e: discover the most recent prior brief in outDir and diff today's surfaced cohort
    // against its `surfaced:` line. Any fs error (no dir, unreadable file) degrades to the
    // empty-prior (first-brief) path. The dir read lives HERE (the edge) — brief.ts stays fs-free.
    const todayIds = surfacedIds(ranking);
    let priorIds: string[] = [];
    let priorDate: string | null = null;
    try {
      if (existsSync(outDir)) {
        const priorFile = selectPriorBriefFile(readdirSync(outDir), day);
        if (priorFile) {
          priorIds = parseSurfacedFrontmatter(readFileSync(join(outDir, priorFile), "utf8"));
          priorDate = priorFile.slice(0, 10);
        }
      }
    } catch {
      priorIds = [];
      priorDate = null;
    }
    const diff = diffSurfaced(todayIds, priorIds, priorDate);
    const md = renderBrief(ranking, diff);
    const path = join(outDir, `${day}.md`);
    mkdirSync(outDir, { recursive: true });
    writeFileSync(path, md, "utf8");
    // RE-R3b: record surfacing on the store AFTER the pure render (per-day idempotent), unless --no-mark.
    // The handled (acted/skipped) records were filtered from the ranking but remain in `store`, so the
    // resave preserves them; only the surfaced ids' surfacedCount/lastSurfacedAt change.
    const mark = flags["no-mark"] !== "true";
    const marked = mark ? markSurfaced(store, surfacedIds(ranking), day).marked : 0;
    if (mark) saveStore(storePath, store);
    const summary = briefSummary(ranking, diff); // SAME source the frontmatter carries (RE-R3e: incl. the delta marker)
    if (asJson) {
      console.log(
        JSON.stringify(
          {
            path,
            date: ranking.today,
            totals: ranking.totals,
            summary,
            marked,
            diff: {
              priorDate: diff.priorDate,
              added: diff.added.length,
              carried: diff.carried.length,
              dropped: diff.dropped.length,
            },
          },
          null,
          2,
        ),
      );
      return;
    }
    const deltaNote = diff.added.length > 0 && diff.priorDate !== null ? `, ${diff.added.length} nye siden sist` : "";
    console.log(
      `Wrote brief: ${path} (${ranking.totals.matched} matched, ${ranking.totals.fresh} fresh, ${marked} surfaced)${deltaNote}`,
    );
    return;
  }

  if (command === "schedule") {
    // RE-R3c — print-first autonomous trigger. Emits (or installs) a launchd plist / cron line firing
    // the DETERMINISTIC brief daily via run-daily.sh; never runs launchctl or the cron table (C2).
    const pillars = splitTopics(flags.pillars);
    if (pillars.length === 0) usage("schedule needs --pillars <a,b>");

    const at = flags.at && flags.at !== "true" ? flags.at : "07:00";
    const [hStr, mStr] = at.split(":");
    const hour = Number.parseInt(hStr, 10);
    const minute = Number.parseInt(mStr ?? "", 10);
    if (Number.isNaN(hour) || Number.isNaN(minute) || hour < 0 || hour > 23 || minute < 0 || minute > 59) {
      usage("--at must be HH:MM (00:00-23:59)");
    }

    let freshDays = 7;
    if (flags["fresh-days"] && flags["fresh-days"] !== "true") {
      const n = Number.parseInt(flags["fresh-days"], 10);
      if (Number.isNaN(n) || n < 0) usage("--fresh-days must be a non-negative integer");
      freshDays = n;
    }

    const platformFlag = flags.platform && flags.platform !== "true" ? flags.platform : "auto";
    if (platformFlag !== "auto" && platformFlag !== "launchd" && platformFlag !== "cron") {
      usage("--platform must be auto|launchd|cron");
    }
    const platform: "launchd" | "cron" =
      platformFlag === "auto"
        ? process.platform === "darwin"
          ? "launchd"
          : "cron"
        : (platformFlag as "launchd" | "cron");

    // Resolve every absolute path FROM THE RUNTIME (never hard-coded → domain-general).
    const here = dirname(fileURLToPath(import.meta.url)); // .../scripts/trends/src
    const wrapperPath = join(here, "..", "run-daily.sh");
    const workingDir = join(here, "..");
    const nodeBin = process.execPath;
    // logPath is anchored to the DATA ROOT (dirname(defaultStorePath())), NOT the --store override, so a
    // custom --store never splits the plist StandardOutPath from the wrapper's own cron.log (sibling of
    // morning-brief/, matching brief.ts defaultBriefDir's dirname(defaultStorePath()) idiom).
    const logPath = join(dirname(defaultStorePath()), "cron.log");
    const root = process.env.LINKEDIN_STUDIO_DATA ?? join(homedir(), ".claude", "linkedin-studio");
    // env is canonical: always NODE_BIN + a resolved-absolute data root — pins the scheduled run to the
    // install-time root AND removes the wrapper's $HOME-unset `set -u` edge under a profile-less env.
    const env: Record<string, string> = { NODE_BIN: nodeBin, LINKEDIN_STUDIO_DATA: root };

    // The wrapper hard-codes the `brief` subcommand → the baked args carry NO leading "brief".
    const args = ["--pillars", pillars.join(","), "--fresh-days", String(freshDays)];
    if (flags.store && flags.store !== "true") args.push("--store", storePath);

    const label = defaultLabel();
    const spec: ScheduleSpec = { platform, label, nodeBin, wrapperPath, args, hour, minute, logPath, workingDir, env };
    const plistTarget = join(homedir(), "Library", "LaunchAgents", `${label}.plist`);

    if (flags.uninstall === "true") {
      console.log(uninstallInstructions(spec, platform === "launchd" ? plistTarget : undefined));
      if (platform === "launchd" && existsSync(plistTarget)) rmSync(plistTarget);
      return;
    }
    if (flags.install === "true") {
      if (platform === "launchd") {
        mkdirSync(dirname(plistTarget), { recursive: true });
        writeFileSync(plistTarget, launchdPlist(spec), "utf8");
        console.log(plistTarget);
        console.log(installInstructions(spec, plistTarget));
      } else {
        console.log(crontabLine(spec));
        console.log(installInstructions(spec));
      }
      return;
    }
    // default / --print — emit the artifact + the activation command. No fs.
    console.log(platform === "launchd" ? launchdPlist(spec) : crontabLine(spec));
    console.log(installInstructions(spec, platform === "launchd" ? plistTarget : undefined));
    return;
  }

  usage(command ? `unknown command: ${command}` : "no command given");
}

main();